Part A
74LCX04MTCX
onsemi
- Lifecycle
- Active
- Stock
- 4842 PCS
- Package
- TSSOP-14
- Series
- Logic - Gates and Inverters
Replacement verdict
Not a drop-in replacement
The 74LCX04MTCX and 74LCX00MTC are not functionally interchangeable despite sharing the same LCX logic family and TSSOP-14 package. The 74LCX04MTCX provides six independent inverters, while the 74LCX00MTC contains four 2-input NAND gates, resulting in different logic functions, gate counts, and pinout assignments. Direct substitution is not possible without circuit redesign.
Different logic function
Different gate count
Different pinout
Different input configuration
Parts at a glance
Part B
74LCX00MTC
onsemi
- Lifecycle
- Active
- Stock
- 8585 PCS
- Series
- Logic - Gates and Inverters
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74LCX04MTCX | 74LCX00MTC | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter | Quad 2-Input NAND Gate | The logic function determines the boolean operation performed; these parts are not functionally interchangeable. |
| Number of Circuits | 6 | 4 | The number of independent gates affects how many signals can be processed in a single package. |
| Number of Inputs per Gate | 1 | 2 | Input count per gate defines the logic capability and wiring requirements of each element. |
| Supply Voltage Range | 2.0 V to 3.6 V | 2.0 V to 3.6 V | The operating voltage range must match the system power rail for reliable logic levels. |
| Output Type | Push-Pull | Push-Pull | Output type determines drive capability and compatibility with bus or point-to-point topologies. |
| Mounting Type | Surface Mount | Surface Mount | Mounting type must match the PCB assembly process and footprint. |
| Package / Case | 14-TSSOP | 14-TSSOP | Package compatibility ensures the part fits the same PCB footprint. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Temperature range must cover the application environment for reliable operation. |
| Logic Family | LCX | LCX | Logic family determines input/output thresholds, speed, and drive characteristics. |
| RoHS Status | RoHS Compliant | RoHS Compliant | RoHS compliance is required for many commercial and consumer product regulations. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LCX04MTCX | 74LCX00MTC |
|---|---|---|
| Supplier | - | onsemi |
| Series | 74LCX | 74LCX |
| Part Status | Active | Obsolete |
| Logic Type | Inverter | NAND Gate |
| Number of Circuits | 6 | 4 |
| Number of Inputs | 1 | 2 |
| Voltage - Supply | 2V ~ 3.6V | 2V ~ 3.6V |
| Current - Quiescent (Max) | 10 µA | 10 µA |
| Current - Output High Low | 24mA, 24mA | 24mA, 24mA |
| Logic Level - Low | 0.7V ~ 0.8V | 0.7V ~ 0.8V |
| Logic Level - High | 1.7V ~ 2V | 1.7V ~ 2V |
| Max Propagation Delay @ V Max CL | 5.2ns @ 3.3V, 50pF | 5.2ns @ 3.3V, 50pF |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functional differences between the 74LCX04MTCX and the 74LCX00MTC?
The 74LCX04MTCX contains six independent inverters (NOT gates), while the 74LCX00MTC contains four independent 2-input NAND gates. Both are low-voltage CMOS logic devices, but they perform different logical functions and have different gate counts.
Are the 74LCX04MTCX and 74LCX00MTC pin-compatible?
No. The 74LCX04MTCX is a 14-pin TSSOP device with six inverters, and the 74LCX00MTC is also a 14-pin TSSOP device with four NAND gates. Although both use the same 14-pin TSSOP package, the pin assignments differ because the internal gate configurations and input/output counts are different. They are not direct drop-in replacements for each other.
What is the operating voltage range for both the 74LCX04MTCX and 74LCX00MTC?
Both devices are part of the LCX family and operate over a supply voltage range of 2.0 V to 3.6 V, with typical operation at 3.3 V. They are designed for low-voltage applications and are not 5 V tolerant on the supply rail, though inputs may be 5 V tolerant depending on the specific manufacturer datasheet.
Can the 74LCX04MTCX be used to replace the 74LCX00MTC in an existing design?
No, not directly. The 74LCX04MTCX provides inversion, while the 74LCX00MTC provides NAND logic. Replacing one with the other would change the logical function of the circuit. A redesign or additional logic gates would be required to achieve equivalent functionality.
What are the output drive capabilities of the 74LCX04MTCX and 74LCX00MTC?
Both devices typically provide ±24 mA output drive at 3.0 V, which is standard for the LCX family. This allows them to drive moderate loads and interface with other logic families. Exact drive strength should be verified from the specific manufacturer datasheet.
Do both the 74LCX04MTCX and 74LCX00MTC support 5 V tolerant inputs?
Yes, LCX-series devices generally feature 5 V tolerant inputs, allowing them to interface with 5 V logic systems while operating at 3.3 V. This is a key feature of the LCX family. However, the supply voltage must remain within the 2.0 V to 3.6 V range.
What are the propagation delay characteristics of the 74LCX04MTCX and 74LCX00MTC?
Both devices typically have a propagation delay of approximately 5 ns at 3.3 V, depending on load conditions and manufacturer. The 74LCX00MTC may have slightly different delay due to its NAND gate configuration, but both are designed for high-speed operation. Exact values should be confirmed from the manufacturer datasheet.
Are the 74LCX04MTCX and 74LCX00MTC available in the same package type?
Yes, both are offered in the 14-pin TSSOP package, indicated by the "MTC" suffix in their part numbers. However, the pinouts are different due to the different logic functions. The "X" suffix on the 74LCX04MTCX typically indicates tape and reel packaging, while the 74LCX00MTC may be supplied in tubes or other packaging depending on the manufacturer.